I worked with the DHS a few years back on a project trying to use ML to detect lies based on a variety of ques, including paul ekman's research into facial expr

I worked with the DHS a few years back on a project trying to use ML to detect lies based on a variety of ques, including paul ekman's research into facial expressions: https://en.wikipedia.org/wiki/Project_Hostile_Intent https://en.wikipedia.org/wiki/Project_Hostile_Intent